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Ahmed R, Gupta R, Akhter Z, Kumar M, Singh PP. TCT-mediated click chemistry for the synthesis of nitrogen-containing functionalities: conversion of carboxylic acids to carbamides, carbamates, carbamothioates, amides and amines. Org Biomol Chem 2022; 20:4942-4948. [PMID: 35660834 DOI: 10.1039/d2ob00324d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here, we report a s-trichlorotriazine (TCT, also known as cyanuric chloride) mediated one-pot general method for the conversion of carboxylic acids into ubiquitous functionalities such as carbamides, carbamates, carbamothioates, amides, and amines. The TCT-mediated activation of acids followed by azidation and heating led to the isocyanate formation via Curtius rearrangement which involves click chemistry in the presence of nucleophiles and provided the coupled product. The TCT was employed at ≤40 mol% with respect to the starting materials; however, its bulk availability and low cost provide a unique opportunity towards its applicability in the synthesis of functional molecules. The optimized conditions have also been successfully demonstrated for gram scale synthesis and late-stage functionalization of natural products and drugs such as podophyllotoxin, eugenol, diosgenin, geraniol and fluvoxamine.
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Affiliation(s)
- Riyaz Ahmed
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
| | - Ria Gupta
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
| | - Zaheen Akhter
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
| | - Mukesh Kumar
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
| | - Parvinder Pal Singh
- Natural Product & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India. .,Academy of Scientific and Innovative Research, (AcSIR), Ghaziabad-201002, India
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2
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Zur AA, Chien HC, Augustyn E, Flint A, Heeren N, Finke K, Hernandez C, Hansen L, Miller S, Lin L, Giacomini KM, Colas C, Schlessinger A, Thomas AA. LAT1 activity of carboxylic acid bioisosteres: Evaluation of hydroxamic acids as substrates. Bioorg Med Chem Lett 2016; 26:5000-5006. [PMID: 27624080 DOI: 10.1016/j.bmcl.2016.09.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 08/27/2016] [Accepted: 09/01/2016] [Indexed: 01/23/2023]
Abstract
Large neutral amino acid transporter 1 (LAT1) is a solute carrier protein located primarily in the blood-brain barrier (BBB) that offers the potential to deliver drugs to the brain. It is also up-regulated in cancer cells, as part of a tumor's increased metabolic demands. Previously, amino acid prodrugs have been shown to be transported by LAT1. Carboxylic acid bioisosteres may afford prodrugs with an altered physicochemical and pharmacokinetic profile than those derived from natural amino acids, allowing for higher brain or tumor levels of drug and/or lower toxicity. The effect of replacing phenylalanine's carboxylic acid with a tetrazole, acylsulfonamide and hydroxamic acid (HA) bioisostere was examined. Compounds were tested for their ability to be LAT1 substrates using both cis-inhibition and trans-stimulation cell assays. As HA-Phe demonstrated weak substrate activity, its structure-activity relationship (SAR) was further explored by synthesis and testing of HA derivatives of other LAT1 amino acid substrates (i.e., Tyr, Leu, Ile, and Met). The potential for a false positive in the trans-stimulation assay caused by parent amino acid was evaluated by conducting compound stability experiments for both HA-Leu and the corresponding methyl ester derivative. We concluded that HA's are transported by LAT1. In addition, our results lend support to a recent account that amino acid esters are LAT1 substrates, and that hydrogen bonding may be as important as charge for interaction with the transporter binding site.
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Affiliation(s)
- Arik A Zur
- Department of Bioengineering and Therapeutic Sciences, Schools of Pharmacy and Medicine, University of California San Francisco, San Francisco, CA 94158, United States.
| | - Huan-Chieh Chien
- Department of Bioengineering and Therapeutic Sciences, Schools of Pharmacy and Medicine, University of California San Francisco, San Francisco, CA 94158, United States
| | - Evan Augustyn
- Department of Chemistry, University of Nebraska Kearney, Kearney, NE 68849, United States
| | - Andrew Flint
- Department of Chemistry, University of Nebraska Kearney, Kearney, NE 68849, United States
| | - Nathan Heeren
- Department of Chemistry, University of Nebraska Kearney, Kearney, NE 68849, United States
| | - Karissa Finke
- Department of Chemistry, University of Nebraska Kearney, Kearney, NE 68849, United States
| | - Christopher Hernandez
- Department of Chemistry, University of Nebraska Kearney, Kearney, NE 68849, United States
| | - Logan Hansen
- Department of Chemistry, University of Nebraska Kearney, Kearney, NE 68849, United States
| | - Sydney Miller
- Department of Chemistry, University of Nebraska Kearney, Kearney, NE 68849, United States
| | - Lawrence Lin
- Department of Bioengineering and Therapeutic Sciences, Schools of Pharmacy and Medicine, University of California San Francisco, San Francisco, CA 94158, United States
| | - Kathleen M Giacomini
- Department of Bioengineering and Therapeutic Sciences, Schools of Pharmacy and Medicine, University of California San Francisco, San Francisco, CA 94158, United States
| | - Claire Colas
- Department of Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York, NY 10029, United States; Department of Structural and Chemical Biology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, United States
| | - Avner Schlessinger
- Department of Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York, NY 10029, United States; Department of Structural and Chemical Biology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, United States
| | - Allen A Thomas
- Department of Chemistry, University of Nebraska Kearney, Kearney, NE 68849, United States.
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3
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Zhang L, Geng Y, Jin Z. Transition-Metal-Free Synthesis of N-Aryl Hydroxamic Acids via Insertion of Arynes. J Org Chem 2016; 81:3542-52. [DOI: 10.1021/acs.joc.6b00111] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lanlan Zhang
- State Key Laboratory of Elementoorganic
Chemistry, Nankai University, Tianjin 300071, China
| | - Yu Geng
- State Key Laboratory of Elementoorganic
Chemistry, Nankai University, Tianjin 300071, China
| | - Zhong Jin
- State Key Laboratory of Elementoorganic
Chemistry, Nankai University, Tianjin 300071, China
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4
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Papadopoulos GN, Kokotos CG. Photoorganocatalytic One-Pot Synthesis of Hydroxamic Acids from Aldehydes. Chemistry 2016; 22:6964-7. [PMID: 27038037 DOI: 10.1002/chem.201600333] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Indexed: 12/27/2022]
Abstract
An efficient one-pot synthesis of hydroxamic acids from aldehydes and hydroxylamine is described. A fast, visible-light-mediated metal-free hydroacylation of dialkyl azodicarboxylates was used to develop the subsequent addition of hydroxylamine hydrochloride. A range of aliphatic and aromatic aldehydes were employed in this reaction to give hydroxamic acids in high to excellent yields. Application of the current methodology was demonstrated in the synthesis of the anticancer medicine vorinostat.
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Affiliation(s)
- Giorgos N Papadopoulos
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodestrian University of Athens, Panepistimiopolis, 15771, Athens, Greece
| | - Christoforos G Kokotos
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodestrian University of Athens, Panepistimiopolis, 15771, Athens, Greece.
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5
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Dettori G, Gaspa S, Porcheddu A, De Luca L. One-Pot Synthesis of Hydroxamic Acids from Aldehydes and Hydroxylamine. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400188] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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6
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Dev D, Palakurthy NB, Thalluri K, Chandra J, Mandal B. Ethyl 2-Cyano-2-(2-nitrobenzenesulfonyloxyimino)acetate (o-NosylOXY): A Recyclable Coupling Reagent for Racemization-Free Synthesis of Peptide, Amide, Hydroxamate, and Ester. J Org Chem 2014; 79:5420-31. [DOI: 10.1021/jo500292m] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Dharm Dev
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Nani Babu Palakurthy
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Kishore Thalluri
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Jyoti Chandra
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Bhubaneswar Mandal
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
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Dettori G, Gaspa S, Porcheddu A, De Luca L. A two-step tandem reaction to prepare hydroxamic acids directly from alcohols. Org Biomol Chem 2014; 12:4582-5. [DOI: 10.1039/c4ob00693c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Palakurthy NB, Dev D, Paikaray S, Chaudhury S, Mandal B. Synthesis of O-benzyl hydroxamates employing the sulfonate esters of N-hydroxybenzotriazole. RSC Adv 2014. [DOI: 10.1039/c3ra44294b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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9
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Wang MZ, Xu H, Liu TW, Feng Q, Yu SJ, Wang SH, Li ZM. Design, synthesis and antifungal activities of novel pyrrole alkaloid analogs. Eur J Med Chem 2011; 46:1463-72. [DOI: 10.1016/j.ejmech.2011.01.031] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Revised: 01/13/2011] [Accepted: 01/17/2011] [Indexed: 10/18/2022]
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10
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Krishnamoorthy R, Lam SQ, Manley CM, Herr RJ. Palladium-catalyzed preparation of Weinreb amides from boronic acids and N-methyl-N-methoxycarbamoyl chloride. J Org Chem 2010; 75:1251-8. [PMID: 20088577 DOI: 10.1021/jo902647h] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A simple protocol for the synthesis of Weinreb benzamides and alpha,beta-unsaturated Weinreb amides through a palladium-catalyzed cross-coupling reaction between organoboronic acids and N-methoxy-N-methylcarbamoyl chloride has been developed. The method is also applicable to the use of potassium organotrifluoroborates.
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Affiliation(s)
- Ravi Krishnamoorthy
- Medicinal Chemistry Department, Albany Molecular Research, Inc., 26 Corporate Circle, P.O. Box 15098, Albany, New York 12212-5098, USA
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11
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Kim JG, Jang DO. A Convenient One-Pot Method for the Synthesis of N-Methoxy-N-methyl Amides from Carboxylic Acids. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.01.171] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Ghosh H, Patel BK. Hypervalent iodine(III)-mediated oxidation of aldoximes to N-acetoxy or N-hydroxy amides. Org Biomol Chem 2009; 8:384-90. [PMID: 20066274 DOI: 10.1039/b917096k] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of various aliphatic and aromatic aldoximes with the hypervalent iodine(iii) reagents (diacetoxyiodo)benzene (DIB) or Koser's reagent [hydroxy(tosyloxy)iodo]benzene (HTIB) gave, respectively, N-acetoxy or N-hydroxy amides in good yields rather than the expected nitrile oxide dimerised product oxadiazole-N-oxides reported to be formed with other oxidising and hypervalent iodine reagents. The acetate or the hydroxyl group of DIB or HTIB attacks on the aryl/alkylnitrile oxides formed in situ, which, upon intramolecular rearrangement, gave the expected N-acetoxy or N-hydroxy amides.
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Affiliation(s)
- Harisadhan Ghosh
- Indian Institute of Technology Guwahati, Guwahati, 781 039, Assam, India
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13
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Histone deacetylase and microtubules as targets for the synthesis of releasable conjugate compounds. Bioorg Med Chem Lett 2009; 19:6358-63. [PMID: 19833515 DOI: 10.1016/j.bmcl.2009.09.075] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2009] [Revised: 09/15/2009] [Accepted: 09/18/2009] [Indexed: 11/21/2022]
Abstract
Design and synthesis of an HDAC inhibitor and its merger with three tubulin binders to create releasable conjugate compounds is described. The biological evaluation includes: (a) in vitro reactivity with glutathione, (b) antiproliferative activity, (c) cell cycle analysis and (d) quantification of protein acetylation. The cellular pharmacology study indicated that the HDAC-inhibitor-drug conjugates retained antimitotic and proapoptotic activity with a reduced potency.
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Riva E, Gagliardi S, Mazzoni C, Passarella D, Rencurosi A, Vigo D, Martinelli M. Efficient Continuous Flow Synthesis of Hydroxamic Acids and Suberoylanilide Hydroxamic Acid Preparation. J Org Chem 2009; 74:3540-3. [DOI: 10.1021/jo900144h] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Elena Riva
- Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via Venezian 21, 20133 Milan, Italy, and NiKem Research Srl, Via Zambeletti 25, 20021 Baranzate, Milan, Italy
| | - Stefania Gagliardi
- Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via Venezian 21, 20133 Milan, Italy, and NiKem Research Srl, Via Zambeletti 25, 20021 Baranzate, Milan, Italy
| | - Caterina Mazzoni
- Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via Venezian 21, 20133 Milan, Italy, and NiKem Research Srl, Via Zambeletti 25, 20021 Baranzate, Milan, Italy
| | - Daniele Passarella
- Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via Venezian 21, 20133 Milan, Italy, and NiKem Research Srl, Via Zambeletti 25, 20021 Baranzate, Milan, Italy
| | - Anna Rencurosi
- Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via Venezian 21, 20133 Milan, Italy, and NiKem Research Srl, Via Zambeletti 25, 20021 Baranzate, Milan, Italy
| | - Daniele Vigo
- Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via Venezian 21, 20133 Milan, Italy, and NiKem Research Srl, Via Zambeletti 25, 20021 Baranzate, Milan, Italy
| | - Marisa Martinelli
- Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano, Via Venezian 21, 20133 Milan, Italy, and NiKem Research Srl, Via Zambeletti 25, 20021 Baranzate, Milan, Italy
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15
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16
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Kokare ND, Shinde DB. N-[(Diphenoxyphosphoryl)oxy]-2-phenyl-1H-benzimidazole as a versatile reagent for synthesisO-alkylhydroxamic acids. J Heterocycl Chem 2008. [DOI: 10.1002/jhet.5570450406] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Funasaka S, Mukaiyama T. A Versatile, Practical, and Inexpensive Reagent, Pyridine-3-carboxylic Anhydride (3-PCA), for Condensation Reactions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2008. [DOI: 10.1246/bcsj.81.148] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Design, synthesis and utilization of a novel coupling reagent for the preparation of O-alkyl hydroxamic acids. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.04.058] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Kim J, Park Y, Kim H, Cho S, Kim J, Lee S, Yoon Y. Convenient Preparation of O‐Alkylhydroxamic Acids Using 2‐Acylpyridazin‐3(2H)‐ones. SYNTHETIC COMMUN 2006. [DOI: 10.1081/scc-200050375] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Jeum‐Jong Kim
- a Department of Chemistry and Environmental Biotechnology, National Core Research Center , Gyeongsang National University , Chinju, Korea
| | - Young‐Dae Park
- a Department of Chemistry and Environmental Biotechnology, National Core Research Center , Gyeongsang National University , Chinju, Korea
| | - Ho‐Kyun Kim
- a Department of Chemistry and Environmental Biotechnology, National Core Research Center , Gyeongsang National University , Chinju, Korea
| | - Su‐Dong Cho
- a Department of Chemistry and Environmental Biotechnology, National Core Research Center , Gyeongsang National University , Chinju, Korea
| | - Ju‐Kyeong Kim
- a Department of Chemistry and Environmental Biotechnology, National Core Research Center , Gyeongsang National University , Chinju, Korea
| | - Sang‐Gyeong Lee
- b Department of Chemistry and Research Institute of Life Science , Gyeongsang National University , Chinju, Korea
| | - Yong‐Jin Yoon
- a Department of Chemistry and Environmental Biotechnology, National Core Research Center , Gyeongsang National University , Chinju, Korea
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20
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Kim M, Lee H, Han KJ, Kay KY. An Efficient One-Pot Synthesis of N-Methoxy-N-methylamides from Carboxylic Acids. SYNTHETIC COMMUN 2006. [DOI: 10.1081/scc-120026336] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Misoo Kim
- a Department of Basic Science , Hankyong National University , Ansung, Korea
| | - Hagyoung Lee
- b Department of Chemical Engineering , Hankyong National University , Ansung, Korea
| | - Ki-Jong Han
- c Department of Molecular Science and Technology , Ajou University , Suwon, Korea
| | - Kwang-Yol Kay
- c Department of Molecular Science and Technology , Ajou University , Suwon, Korea
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22
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Hioki K, Kobayashi H, Ohkihara R, Tani S, Kunishima M. Preparation of Weinreb Amides Using 4-(4,6-Dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium Chloride (DMT-MM). Chem Pharm Bull (Tokyo) 2004; 52:470-2. [PMID: 15056969 DOI: 10.1248/cpb.52.470] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Weinreb amides were successfully prepared from the corresponding carboxylic acids using 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMT-MM) in the solvents, methanol, isopropyl alcohol, and acetonitrile, which can solubilize DMT-MM. A variety of carboxylic acids were converted to the corresponding Weinreb amides in excellent yields by simply mixing with DMT-MM and N,O-dimethylhydroxylamine hydrochloride.
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Affiliation(s)
- Kazuhito Hioki
- Faculty of Pharmaceutical Sciences and High Technology Research Center, Kobe Gakuin University, Japan
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Giacomelli G, Porcheddu A, Salaris M. Simple one-flask method for the preparation of hydroxamic acids. Org Lett 2003; 5:2715-7. [PMID: 12868897 DOI: 10.1021/ol034903j] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] A one-step conversion of carboxylic acids to hydroxamic acids under very mild conditions is described. This simple and efficient method has been applied for the synthesis of enantiopure hydroxamate of alpha-amino acids and peptides.
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Affiliation(s)
- Giampaolo Giacomelli
- Dipartimento di Chimica, Università degli Studi di Sassari, via Vienna 2, I-07100 Sassari, Italy.
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Bailén MA, Chinchilla R, Dodsworth DJ, Nájera C. O-Succinimidyl-1,3-dimethyl-1,3-trimethyleneuronium salts as efficient reagents in active ester synthesis. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00090-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Albericio F, Bailén MA, Chinchilla R, Dodsworth DJ, Nájera C. 2-Mercaptopyridine-1-oxide-based peptide coupling reagents. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00985-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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